In August of 2000, Advanced Chemistry Development (ACD) released the free all-purpose chemical drawing and graphics software ChemSketch; recently, ACD announced its 150,000th download. The software allows users to "click and draw molecules, ions, stereobonds, text, polygons, arrows, and do automatic calculation of Molecular Weight and formula and see estimates of density, refractive index, molar...

This site contains many chemistry applets created by Jonathan Goodman and his group at Cambridge University. An example of an applet available is the Molecular Weight Calculation; whereby entering in a molecular formula, users are able to discover the HRMS weight, the molecular weight, the element percents, and the Molecular Ion Isotope Pattern. Interactive graphs are also available to assist...

Chimera is a multi-faceted, interactive molecular graphics program, which can be downloaded from the Web site of the Computer Graphics Laboratory (CGL) at the University of California--San Francisco. Any interested user is welcome to use this molecular modeling software at no charge for academic, government, non-profit, or personal use. An astonishingly wide array of applications are possible with...